5ce8b438da
The error log is as follows: ../../third_party/skia/include/core/SkSpinlock.h:24: error: undefined reference to 'SkPODSpinlock::contendedAcquire()' collect2: error: ld returned 1 exit status [mtklein added below here] Despite the presence in include/ and the added SK_API, this file is not part of Skia's public API... it's just used by files which are. TBR=reed@google.com Review URL: https://codereview.chromium.org/1229003004
45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
/*
|
|
* Copyright 2015 Google Inc.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license that can be
|
|
* found in the LICENSE file.
|
|
*/
|
|
|
|
// This file is not part of the public Skia API.
|
|
|
|
#ifndef SkSpinlock_DEFINED
|
|
#define SkSpinlock_DEFINED
|
|
|
|
#include "SkAtomics.h"
|
|
|
|
#define SK_DECLARE_STATIC_SPINLOCK(name) namespace {} static SkPODSpinlock name
|
|
|
|
// This class has no constructor and must be zero-initialized (the macro above does this).
|
|
class SK_API SkPODSpinlock {
|
|
public:
|
|
void acquire() {
|
|
// To act as a mutex, we need an acquire barrier if we take the lock.
|
|
if (sk_atomic_exchange(&fLocked, true, sk_memory_order_acquire)) {
|
|
// Lock was contended. Fall back to an out-of-line spin loop.
|
|
this->contendedAcquire();
|
|
}
|
|
}
|
|
|
|
void release() {
|
|
// To act as a mutex, we need a release barrier.
|
|
sk_atomic_store(&fLocked, false, sk_memory_order_release);
|
|
}
|
|
|
|
private:
|
|
void contendedAcquire();
|
|
bool fLocked;
|
|
};
|
|
|
|
// For non-global-static use cases, this is normally what you want.
|
|
class SkSpinlock : public SkPODSpinlock {
|
|
public:
|
|
SkSpinlock() { this->release(); }
|
|
};
|
|
|
|
#endif//SkSpinlock_DEFINED
|